FLUKA: THRESHOLd
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THRESHOLd
Defines the energy threshold for star density scoring
Sets thresholds for elastic and inelastic hadron reactions
See also PART-THR, PHYSICS
WHAT(1)
, WHAT(2)
: not used
WHAT(3)
= threshold kinetic energy for hadron elastic scattering
Default
: same as for particle transport (set by option
PART-THR or by default (i.e. the minimum one for which
the present FLUKA physics can work, typically 0.02 GeV
depending on the hadron)
WHAT(4)
= threshold kinetic energy for hadron inelastic reactions
Default
: same as for particle transport, as defined by option
PART-THR or by default. The default thresholds are: 0.001 GeV
for all neutral hadrons except neutrons, 0.02 GeV for high
energy neutrons, the Coulomb barrier for charged hadrons,
0.0 for particles which annihilate at rest - but the latter
will not undergo any inelastic interaction between the
interaction threshold, typically around 0.001 GeV, and 0.0
WHAT(5)
: not used
WHAT(6)
= threshold kinetic energy for star scoring
Default
: the same values as set for inelastic reactions
(see WHAT(4)
above)
SDUM
: not used
Default
(option THRESHOLd not given): the threshold for star scoring
is set at 20 MeV for protons and neutrons, and at 50 MeV for
all other hadrons
Notes:
1) The possibility to change the threshold for elastic
scattering or inelastic collisions (WHAT(3)
and WHAT(4)
)
is not to be used in normal transport problems, but is
made available to investigate the relative importance of
different processes on the studied problem.
2) For reasons explained in Note 3) to command SCORE, it is
recommended to set the threshold for star scoring (WHAT6))
equal to 0.050 GeV overriding the default of 0.020 GeV.
A 0.050 GeV cutoff was used in the past to establish
so-called omega factors which are still currently used to
estimate induced activity (see [Ran70b,Hof75a,Hof75b]).
Stars defined in this way do not include those produced by
annihilating particles.
3) The threshold for star scoring requested by option
THRESHOLd applies ONLY to the output related to options
SCORE and USRBIN. The number of stars reported in the
summary statistics at the end of the standard output
is always based on the actual energy thresholds for
nonelastic interactions (except for neutrons for which
stars are reported above 20 MeV).
Example 1:
THRESHOLd 0.0 0.0 2.0 0.0 0.0 0.0
Example 2:
THRESHOLd 0.0 0.0 0.0 0.0 0.0 0.05
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